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Evaluation of an improved DNA probe for diagnosis of pertussis
E Reizenstein1, S Löfdahl, M Granström
1Department of Bacteriology, National Bacteriological Laboratory, Stockholm, Sweden.
Abstract:
A Bordetella pertussis specific subclone, pRZ61, of a Bordetella genus-specific clone, pB23, was evaluated on nasopharyngeal aspirates of 179 patients with suspected pertussis. Hybridization was performed directly after spotting or after 1-3 days of preculture of the nylon membranes on solid culture medium. A direct comparison of the two probes was obtained by reprobing with the subclone the same membranes that had been hybridized with the parent probe. pRZ61 detected 50% of the serologically defined cases of pertussis, that is, had the same sensitivity as standard culture. Specificity as compared with serology was close to 100%. The increasing sensitivity and the corresponding decreasing specificity after preculture noted for pB23 was not seen with the subclone. The study showed that the improved probe represents a rapid diagnostic method in pertussis.
Insights
A new Bordetella pertussis probe (pRZ61) shows high specificity for diagnosing whooping cough. This rapid diagnostic method matches standard culture sensitivity and offers near-perfect specificity.
Area of Science:
- Microbiology
- Infectious Diseases
- Molecular Diagnostics
Background:
- Pertussis, commonly known as whooping cough, is a highly contagious respiratory infection caused by Bordetella pertussis.
- Accurate and rapid diagnosis is crucial for effective treatment and public health control.
- Current diagnostic methods, including culture and serology, have limitations in terms of speed and sensitivity.
Purpose of the Study:
- To evaluate the diagnostic performance of a Bordetella pertussis-specific subclone probe (pRZ61) compared to a Bordetella genus-specific probe (pB23).
- To assess the utility of pRZ61 as a rapid diagnostic method for pertussis directly from nasopharyngeal aspirates.
Main Methods:
- Nucleic acid hybridization was performed on nasopharyngeal aspirates from 179 patients with suspected pertussis.
- Hybridization was conducted directly after sample spotting or after a short preculture period (1-3 days).
- A Bordetella pertussis-specific subclone (pRZ61) and its parent Bordetella genus-specific clone (pB23) were used as probes, with direct comparison through reprobing.
Main Results:
- The pRZ61 probe detected 50% of serologically confirmed pertussis cases, demonstrating sensitivity comparable to standard culture methods.
- Specificity of the pRZ61 probe was nearly 100% when compared to serological results.
- Unlike the parent probe (pB23), the pRZ61 subclone did not show decreased specificity with increased sensitivity after preculture.
Conclusions:
- The Bordetella pertussis-specific subclone probe (pRZ61) is a highly specific tool for diagnosing pertussis.
- This improved probe offers a rapid diagnostic method for pertussis, with performance comparable to standard culture.
- pRZ61 represents a valuable advancement in the rapid molecular diagnosis of whooping cough.